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My '87 Prelude has a mechanical cable that spins from the rotation of the transmission. The speedometer cable enters the transmission vertically on the passenger's side of the engine compartment. The cable spins from a gear arrangement built into the transmission. The cable rises up from the transmission and bends to a level position as it crosses over the top of the engine. The cable bends again towards the firewall as the cable comes over the engine to the driver's side of the engine compartment. The cable goes through the firewall and into the back of the speedometer. I just replaced mine and it was a pretty easy job except for the clip that needs to be removed at the tranny end of the cable. Wrap a rag around the cable so that if you lose the clip, it doesn't fall into the transmission. Also, the clip is covered by a boot that protects the cable/tranny end from contamination. Pull the boot up and you can get to the clip. When putting the clip back on, put the clip in the boot BEFORE lowering the cable end into the tranny. You then put the clip on by feeling the clip "click" into the groove as the cable goes in. I spent hours trying to put the clip on and then trying to pull the little boot over the clip. The clip kept coming out and the boot wouldn't stretch over the clip's ends. Good Luck.

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Q: Where so you find the speedometer sensor on a 1987 Prelude SI?
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